Test data is incorporated within the microcode of a bit-slice microprocessor to be used during development of the program to verify program performance and during operation of the program as a built-in test. Little additional hardware is required and there is minimal impact on the structure of the program....http://www.google.fr/patents/US5185882?utm_source=gb-gplus-shareBrevet US5185882 - Bit-slice microprocessor test system
